Steam-engine.



G. PSAREAS & N. PARKAS.

STEAM ENGINE.

I APPLICATION IILBD 1:20.22, 1909.

1,4 Patented Sept 27, 1910.

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G. PSAREAS & N. PARKAS.

STEAM ENGINE.

APPLIUATION FILED D30. 22 1909. 971,40&

Patented Sept 27, 1910.

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INVENTORS,

FIQE.

GEORJE PSAREAS AND NICK PARKAS, 0F HOLYOKE, MASSACHUSETTS.

STEAM-ENGINE.

To all whom it may concern:

Be it known that we, GEoRJE PSAREAS and NICK PARKAS, subjects of the King of Greece, and residents of I-Iolyoke, in the county of Hampden and State of Massachusetts, have invented certain new and useful Improvements in Steam-Engines, of which the following is a full, clear, and exact description.

The present invention which pertains to reciprocating piston steam engines comprises certain new and peculiar constructions and features in conjunction with an oscillatory disk shaped valve plate to the end of producing an engine in which the portion thereof containing the valve, together with such valve, may be most simply and inexpensively provided, and also to the end of acquiring a steam engine, the valve mechanism of which may be stated as being sensitive and in other respects reliable and eflicient in operation.

The invention is particularly described in conjunction with the accompanying drawings and is defined in the appended claims.

In the drawings :Figure l is a side elevation of a steam engine in which the present improvements are embodied and representing the same in their external aspect. Fin. 2 is a central longitudinal vertical section through the cylinder of the engine and conjunctive parts with which the valve is associated. Fig. 3 is a plan view of the cylinder with the dome or casing having separated chambers therein removed, the disk valve being also absent and especially illustrating the location of the front and rear pairs of steam inlet and exhaust conduits and the grouped arrangement of the two pair of ports. Fig. 4: is a similar view showing the disk valve as in its place. Fig. 5 is a vertical cross sectional viewvon line 55, Fig. 2. Figs. 6 and 7 are fragmentary sectional views, illustrating minor details of construction hereinafter referred to.

Similar characters of reference indicate corresponding parts in all of the views.

In the drawings, A represents the cylinder of the steam engine, the piston B in which operates the driving shaft thereof in the usual manner.

a a represent conduits leading from communication with opposite end portions of Specification of Letters Patent.

Application filed December 22, 1909.

Patented Sept. 27, 1910.

Serial No. 534,444.

the cylinder chamber to, and terminating in ports at the top of the built up and flat topped extension 6, said ports being designated by the numerals l and 2; and (Z (Z represent exhaust conduits leading from connnunication with opposite end portions of the cylinder chamber to and terminating in the ports 3 and t at the top of the aforementioned extension 5.

The inlet or pressure conduits and ports are located to the front of the median line or vertical longitudinal plane of the cylinder, while the conduits (Z for the exhaust and their ports 3 and 4 have their locations to the rear of the median line of the cylinder. The upper part of the cylinder is formed with a circular pocket f at its portion comprising the group of ports 1 and 2 and 3 and 4; and the wall of such pockets is made with a forwardly opening recess 9, and it is also exteriorly curved, as represented at /L.

C represents the valve plate which is of circular form and is accommodated with a close although comparatively free fit in the said pocket f and covers the two pairs of approached exhaust and inlet ports, and has two apertures z' and 6, one forward of its center and the other equally as far rearwardly from its center.

D represents a casing here represented as in the form of a dome, located above and forming a closure for the valve plate C and the pocket in which it is fitted, this casing being securely and tightly confined in its place by bolts or other proper fastenings.

The partition j which is arranged with relation to the longitudinal dimension of the cylinder divides the casing D into two separated chambers I and E, into one of which the inlet conduit I leads for the conveyance of steam and from the other E of which the exhaust way or conduit leads, as represented in Fig. 5.

The disk shaped valve plate has an arm m projecting therefrom forwardly through the recessed front of the pocket in which the valve is fitted, and a rod or bar a is connected with this arm for imparting a partial rotary reciprocatory movement to the valve,this bar n in the present instance being represented as one operated by the eccentric 0 running with the engine and being only one of several well known forms of means for alternately changing the posi tion of a valve.

2? represents a curve sweep plate or cap carried on the arm closely conforming to and fitting the aforementioned curved wall it and serving at all times to cover the forwardly opening recess 9 which is necessary to permit the unobstructed reversed swinging movement of the valve plate operating arm.

W hen the valve is positioned as shown in Fig. 4 with its aperture 2' in registry with the right hand one, Fig. 1, of the inlet ports, steam will be admitted from the steam chest or pressure chamber I at the right hand end of the cylinder to drive the piston leftward; and when the valve is so positioned the other aperture 6 in the rear portion of the valve is in registry with the exhaust port t so that the steam is freely discharged from the cylinder at the left of the piston at this time. But, of course, when the piston completes its stroke to the leftward the valve reversing mechanism properly timed therefor will so swing the valve plate that its aperture 2' will be in registry with the steam inlet or pressure port 2 whereupon the piston will be driven rightward and at the same time the valve aperture (3 will be in registry with the exhaust port 3 so that the right hand portion of the cylinder chamber will freely exhaust.

The pocket for receiving the valve plate may, as before stated and particularly indi cated in Figs. 6 and T, be constituted by an upstanding wall, either integrally formed as a part of the cylinder top extension 6, or as by ring shaped frame screwed thereto, (Fig. 7 particularly), or it may be constituted by a circularly rabbeted formation at the lower part of the dome shaped partitioned casing D, as represented in the sectional views, Figs. 2 and 5.

It is to be perceived from the consideration of the constructions described and the illustrations thereof furnished that in the production of these engine improvements economy and comparatively low cost may be observed because of the simplicity and small number of the parts required and the ease with which they may be machined or finished.

We claim 1. In a steam engine, a cylinder having conduits leading from communication with opposite ends of its chamber to and terminating in ports at the exterior of the cylinder and located to one side of the median line of the latter, and exhaust conduits lead ing from communication with opposite end portions of the cylinder chamber to and terminating in ports at the exterior of the latter which are to the opposite side of such median line, a valve plate arranged to cover the pairs of exhaust and inlet ports and having two apertures, one for registering with either of the inlet ports and the'other for registering with either of the exhaust ports, a casing forming a closure for the valveplate having a longitudinal partition therein whereby separated chambers are created, and in which the valve apertures are respectively located, a steam inlet conduit connected with one of the chambers, an exhaust way leading from the other, and means for 0s cillating the valve plate.

2. In a steam engine, a cylinder having pairs of inlet and exhaust conduits arranged at opposite sides of the central longitudinal plane of the cylinder and those of each pair having communication with end portions of the cylinder chamber and terminating in grouped ports at the top of the cylinder, and the apparatus being formed with a circular pocket at its port comprising portion with an outwardly opening recess, a circular valve plate, accommodated in said pocket, covering the pairs of approached exhaust and inlet ports and having two apertures in its front and rear portions respectively, a casing above and forming a closure for the valve plate and its pocket having a longitudinal partition therein producing separated chambers at opposite sides thereof and with which the valve apertures respectively have communication, a steam inlet conduit connected with the front chamber and an exhaust way leading from the other chamber, an arm projecting from the circular valve plate outwardly through the recessed side of the pocket, and a rod or bar connected with said arm for imparting a partial rotary reciprocatory movement to the Valve plate.

3. In a steam engine, a cylinder having pairs of inlet and exhaust conduits arranged at opposite sides of the central longitudinal plane of the cylinder and those of each pair having communication with end portions of the cylinder chamber and terminating in grouped ports at the top of the cylinder, and the apparatus being formed with a circular pocket at its port comprising portion with a forwardly opening recess, the wall of such pocket being curved at its front, a circular valveplate, accommodated in said pocket, covering the pairs of approached exhaust and inlet ports and having two apertures, one in its front, and the other in its rear portion, a casing above and forming a closure for the valve-plate and its pocket, having a longitudinal partition therein with separated chambers at front and rear there of and with which the two valve apertures respectively have communication, a steam inlet conduit connected with the front chamber and an exhaust way leading from the other chamber, an arm projecting from the circular valve-plate forwardly through the recessed front of the pocket, a rod or bar connected therewith for imparting a partial rotary reciprocatory movement to the valve plate, and a curved sweep-plate or cap carried on the arm, fitting the said curved Wall, and covering the forwardly opening recess.

Signed by us at Springfield, Mass, in presence of two subscribing Witnesses.

GEORJE PSAREAS. NICK PARKAS. Witnesses:

M. S. BELLoWs, G. R. DRISCOLL. 

